There is a book published by AISC called Hollow Structural Sections, connections manual. What I think you are talking about is punching shear. This book has an example of this particular situation as well as tables (Table 4-8)for standard shear tab connetions. The page you are looking for starts on 4-96 of this book and runs through 4-108. If you are unable to get your hands on a copy you may e-mail me and I could possibly fax or e-mail pdf's for your use.
wbailey@sesinconline.com